Jack



G. F. RYAN JACK 2 Sheets-Sheet 1 1 Original Filed Jan. 28; 1935 z .1 a WW a HUN. 4 1 0 2 w a r 2 k. 2

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JACK

Original Filed Jan. 28, 1935 2 Sheets-Sheet 2 Patented Sept. 21, 1937 PATENT OFFICE JACK.

George F. Ryan, Peabody, Mass, assignor to.

United Shoe Machinery'C'orporation, Paterson,

N. J., a corporation of New' Jersey original application January 28, 1935, Serial No.

3,751. Divided and-this application 17, 1936, Serial No. 116,365 A December Claims. (01. 12-123) This invention relates to mechanism for manipulatingilasts, and is disclosed as embodied in a. jack for operating collapsible lasts of the type shownin my application, Serial No. 3,751, filed January 28,1935, of which this application is a division. 7 i i The last described ,in the application referred to comprises-a bonding or tension link and a second operating, tightening or looking link, these links being pivoted to each other and also pivot ally mounted in thetwo last parts in such manner thatswinging thesecond link will move the axis of the tension link past the axis of rotation of the second link, to pull the last parts tightly together and to lock them in such position. The two links operate much as a toggle joint.

An important feature of the present invention resides in the operating means provided to turn the'second or toggle link The toggle link is arranged to beengaged and operated by a member entering thelast through its, upper surface. As illustrated, that member is mounted on a jack haying a second member arranged toengage and grip the last thimble, these two members being relatively movable to move the last operating member into and out of the last.

These and other features of the invention comprising certain combinations and arrangements of parts will be apparent from the following description of a preferred embodiment of the invention shown in the drawings, in which Fig. 1 shows a last of the type referred to, in

Q L operable position, mounted on the jack prior to operation of the jack;

Fig. 2 shows the last on the jack after operation of the jack, the last being collapsed;

Fig. 3 shows the entire jack, with the last as in Fig. 2; and i Fig. 4 illustrates a detail of the jack and is a cross-section on the line IVIV of Fig. 3.

The illustrated last comprises a forepart I0 and a heel part I2. These are both hollow and are cast preferably from aluminum or one of its alloys, for example, by the method explained in United States Letters Patent No. 2,018,675, granted October 24, 1935, on an application of Frank P. Hyde. The joint surface between the two last parts consists, as illustrated, of two ingages a pin 22 in the forepart and is pivoted at '23 to the already-mentioned second tightening, looking or toggle link 24 centered on a pivot pin 26in the heel part. The link 20 is arched at 28 to enable it to embrace the pin 26 so that the center of the pin 26 lies a little above a line 21 joining the centers of the pins 22, 23 when the last is inoperative position with the pin 26 rest- '23 and its end of the link 20 forward and toward the bottom in the last, thus enabling the collapse of the last, as shown in Fig. 2.

This collapsing movement is efiected by the illustrated jack 30, of thepresent invention, comprising a. frame 32 in which is mounted a vertically slidingtube 34 normally pressed upwardly by a spring 36 located between a rib 38 in the frame 32 and a collar 40 adjustable on the tube. The tube 34 carries near its upper end a flat collar 42, and its upper end is formed as a conically bored, partially split thimble 48 knurled on its outside surface. Inside the tube is a rod 44 .with a conical upper end 46 located in the thimble 48. The rod 44 has a ball-and-socket joint 50 at its lower end. The jack is also provided with a fixed pin 52 projecting from its upper end and arranged to extend through a hole 54 in the upper surface of the heel part l2. The upper end of the pin 52 is arranged to cooperate with a tooth 56 on the link 24 and the pin 52 has a notch 58 arrangedto cooperate with a second tooth 60 on the link 24, the pin 52 thus acting as a rack and the link 24 as a pinion. The frame 32 is rotatable upon the base of the jack into any orientation desired by the operator.

To collapse the last the thimble 62 of the last is slipped over the thimble 48 and the hole 54 over the pin 52, the last dropping to the collar 42. The rod 44 is then pulled down, and the initial movement of the head 46 expands the knurled thimble 48, causing it to grip the last thimble 62 when further movement of the rod 44 draws the last straight downward. The fixed pin 52 turns the link 24 and unlocks the last, which may then be collapsed by the operator intothe position shown in Fig. 2, the shoe being then removable from the last. The last cannot be removed from the jack While it is in collapsed or unlocked position.

The rod 44 is pulled downby a treadle 64 and treadle rod 66 which is connected to the joint 50. Operation of the treadle pulls down the rod 44 and tube 34 and compresses the spring 36 which assists in relocking the last when the operator releases the treadle 64. A second treadle 68, springpressed at 69, is provided (Figs. 3 and 4) which, when depressed, operates a lever 10 pivoted at 12 in the foot of the jack and having its free end located under the end of the treadle 64, so that depression of the treadle 68 raises the treadle 64 and the rod 44, in case the springs 36 and 69 are unable to do so. There is play at 14 between the rod 44 and. the tube 34 so that the thimble 48 will be collapsed by the stresses in its unslotted lower end before the joint 50 begins to push against the tube 34 and to push the last off the pin 52, thus swinging the link 24 back into the Fig. 1 position and locking the last, which may then be removed from the thimble 48 and pin 52.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A jack having an expansible member arranged to enter the thimble of a last, a plunger for expanding said member, a second member arranged to project through the upper surface of the last and to operate the bonding mechanism thereof when entering and leaving the last, and means for operating the plunger and relatively to move the expansible member and the said second member to cause the second member to operate the bonding mechanism of a last mounted on the expansible member.

2. A jack having a vertically movable expansible member arranged to enter the thimble of a last, a plunger within said expansible member arranged to expand it and to move it vertically after its expansion, a third member fixed on the jack and arranged to project through the upper surface of a last on the expansible member, and to move relatively thereto to operate the bonding mechanism of the last when the plunger moves the expansible member, and means for operating the plunger.

3. A jack having a vertically movable expansible member arranged to enter the thimble of a last, a plunger within said expansible member arranged to expand it and to move it downward after its expansion and to move it upward after releasing it from expansion, a third member fixed on the jack and arranged to project through the upper surface of a last on the expansible member, and to move relatively thereto to operate the bonding mechanism of the last when the plunger moves the expansible member, and means for operating the plunger.

4. A jack having a vertically movable expansible member arranged to enter the thimble of a last, a plunger within said expansible member arranged to expand it and to move it downward after its expansion and to move it upward after releasing it from expansion, 2, third member fixed on the jack and arranged to project through the upper surface of a last on the expansible member, and to move relatively thereto to operate the bonding mechanism of the last when the plunger moves the expansible member, said third member carrying one member of a toothed gearing device arranged to cooperate with a corresponding member on the said bonding mechanism, and means for operating the plunger.

5. A jack having a vertically movable expansible member arranged to enter the thimble of a last, a plunger within said expansible member arranged to expand it and to move it downward after its expansion and to move it upward after releasing it from expansion, a third member fixed on the jack and arranged to project through the upper surface of a last on the expansible member, and to move relatively thereto to operate the bonding mechanism of the last when the plunger moves the expansible member, said third member having a notch arranged to cooperate with a tooth on the said bonding mechanism, and means for operating the plunger.

GEORGE F. RYAN. 

